CLARK : THE ECHINODEKMS OF PERU. 323 



group also, but the exact point on the South American coast where it 

 was taken is not known. The Panamic element in the Peruvian fauna, 

 therefore, contains twenty-five species, but many of these must be of 

 irregular or rare occurrence, since only nine are in the Coker collection. 

 South of Aguja Point twenty-six species have been taken. 1 Of 

 these, two (Luidia bellon&e and Stichopus fuscus) have a remarkable 

 range, extending from the Gulf of California to Chile and (in the case 

 of Stichopus) even to Patagonia. Another (Heliaster polybrachius) is 

 known only from the Peruvian coast in the vicinity of Aguja Point 

 (say 3 30' - 7 30' S. lat.) and certainly cannot be classed with the 

 Chilean f uina. The little ophiuran taken by Coker near San Lorenzo 

 Island, off Callao, is apparently Amphipholis pug 'etana, a North American 

 species ; it is certainly not A. laevidisca, known from Chile; the genus 

 is cosmopolitan, and some excellent authorities consider that A. squa- 

 mata is equally wide-ranging, and they would doubtless refer these Peru- 

 vian specimens to it. Deducting these four species, there are twenty-two 

 which may fairly be referred to the Chilean fauna. Of these, the follow- 

 ing eight have been reported from north of Aguja Point : 



Asterina chilensis Tetrapygus niger 



Stichaster aurantiacus Arbacia spatuligera 



Heliaster helianthus Strongylocentrotus gibbosus 



Ophiactis kroyeri Phyllophorus peruvianus 



These species are all in the Coker collection, but the specimens of 

 Phyllophorus were not taken north of 9 S. lat. Of the remaining 

 fourteen species supposed to occur along the southern shores of Peru, 

 only Strongylocentrotus albus was taken by Dr. Coker : 



Tosia verrucosa Asterias gelatinosa 



Odontaster singularis Amphipholis laevidiscus 



Asterina calcarata Amphiodia chilensis 



Parasterina obesa Podophora pedifera 



Echinaster cribella Strongylocentrotus albus 



cylindricus Cticumaria leonina 

 Henricia hyadesi godeffroyi 



1 The exact localities where Of>hidiaster lu^wigi, recorded from "Perou," Holo- 

 thnria chilensis from " Chile," and Colochirus peruanus from "Peru," were taken are 

 unknown, and they are omitted from this discussion. 



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